Portsmouth, NH
Climate overview — based on NOAA 1991-2020 normals from ELIOT, ME US.
Year-round temperatures (°F)
Avg high
Avg low
Best time to visit Portsmouth
Full guide →Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | °F | °F | °F | 3.39 in | 15.9 in | 10 |
| February | °F | °F | °F | 3.53 in | 16.2 in | 8 |
| March | °F | °F | °F | 4.58 in | 10.5 in | 10 |
| April | °F | °F | °F | 4.71 in | 1.2 in | 10 |
| May | °F | °F | °F | 3.97 in | — | 12 |
| June | °F | °F | °F | 4.32 in | — | 11 |
| July | °F | °F | °F | 3.85 in | — | 10 |
| August | °F | °F | °F | 3.60 in | — | 9 |
| September | °F | °F | °F | 4.00 in | — | 8 |
| October | °F | °F | °F | 4.83 in | 0.1 in | 10 |
| November | °F | °F | °F | 3.97 in | 0.9 in | 10 |
| December | °F | °F | °F | 4.67 in | 11.0 in | 11 |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when